我目前正在尝试使用 BOOST_SPIRIT_DEFINE/DECLARE/INSTANTIATE
将我的 boost spirit x3 解析器分成不同的 _def 和 .cpp 文件,但我一直收到链接错误。
HERE是我的解析器,它是分开的。
链接器错误读取
<artificial>:(.text.startup+0xbb): undefined reference to `bool kyle::parser::impl::parse_rule<__gnu_cxx::__normal_iterator<char*, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > >, boost::spirit::x3::context<boost::spirit::x3::skipper_tag, boost::spirit::x3::char_class<boost::spirit::char_encoding::standard, boost::spirit::x3::space_tag> const, boost::spirit::x3::unused_type>, boost::spirit::x3::unused_type const>(boost::spirit::x3::rule<kyle::parser::impl::identifier_class, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, false>, __gnu_cxx::__normal_iterator<char*, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > >&, __gnu_cxx::__normal_iterator<char*, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > const&, boost::spirit::x3::context<boost::spirit::x3::skipper_tag, boost::spirit::x3::char_class<boost::spirit::char_encoding::standard, boost::spirit::x3::space_tag> const, boost::spirit::x3::unused_type> const&, boost::spirit::x3::unused_type const&)'
我做错了什么?我怎样才能使我的示例起作用?
配置文件:
#include <boost/spirit/home/x3.hpp> namespace kyle{ namespace parser{ namespace x3 = boost::spirit::x3; typedef std::string::const_iterator iterator_type; typedef x3::phrase_parse_context<x3::ascii::space_type>::type context_type; } }
文字.cpp:
#include "literals_def.hpp" #include "config.hpp" #include <boost/spirit/home/x3.hpp> namespace kyle { namespace parser { namespace impl { BOOST_SPIRIT_INSTANTIATE(identifier_type, iterator_type, context_type); } } }
文字定义.hpp:
#include <boost/spirit/home/x3.hpp> #include "literals.hpp" namespace kyle { namespace parser { namespace impl { namespace x3 = boost::spirit::x3; const identifier_type identifier = "identifier"; auto const identifier_def = x3::alpha >> *x3::alnum; BOOST_SPIRIT_DEFINE(identifier) } impl::identifier_type identifier(){ return impl::identifier; } } }
文字.hpp:
#include <boost/spirit/home/x3.hpp> namespace kyle{ namespace parser{ namespace impl { namespace x3 = boost::spirit::x3; struct identifier_class; typedef x3::rule<identifier_class, std::string> identifier_type; BOOST_SPIRIT_DECLARE(identifier_type) } impl::identifier_type identifier(); } }
主要.cpp:
#include "literals.hpp" #include <iostream> template<typename Parser> bool test(std::string str, Parser&& p, bool full_match = true) { auto in = str.begin(); auto end = str.end(); bool ret = boost::spirit::x3::phrase_parse(in, end, p, boost::spirit::x3::space); ret &= (!full_match || (in == end)); return ret; } int main(){ auto b = test("fobar", kyle::parser::identifier()); std::cout << b << std::endl; }
最佳答案
两点:
您将上下文定义为
typedef x3::phrase_parse_context<x3::space_type>::type context_type;
但是,您尝试使用
x3::space
调用它而不是x3::ascii::space
.错误消息中的提示是您没有包含:
/home/sehe/custom/boost/boost/spirit/home/x3/nonterminal/rule.hpp:116: undefined reference to 'bool kyle::parser::impl::parse_rule<__gnu_cxx::__normal_iterator<char const*, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > >, boost::spirit::x3::context<boost::spirit::x3::skipper_tag, boost::spirit::x3::char_class<boost::spirit::char_encoding::standard, boost::spirit::x3::space_tag> const, boost::spirit::x3::unused_type>, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > >(boost::spirit::x3::rule<kyle::parser::impl::identifier_class, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, false>, __gnu_cxx::__normal_iterator<char const*, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > >&, __gnu_cxx::__normal_iterator<char const*, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > const&, boost::spirit::x3::context<boost::spirit::x3::skipper_tag, boost::spirit::x3::char_class<boost::spirit::
char_encoding::standard
, boost::spirit::x3::space_tag> const, boost::spirit::x3::unused_type> const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >&)'
迭代器类型被推断为
std::string::iterator
, 不是std::string::const_iterator
.修复它或不使用auto
总是:
完整代码
为了后代
配置文件:
#include <boost/spirit/home/x3.hpp> namespace kyle{ namespace parser{ namespace x3 = boost::spirit::x3; typedef std::string::const_iterator iterator_type; typedef x3::phrase_parse_context<x3::space_type>::type context_type; } }
文字.cpp:
#include "literals_def.hpp" #include "config.hpp" #include <boost/spirit/home/x3.hpp> namespace kyle { namespace parser { namespace impl { BOOST_SPIRIT_INSTANTIATE(identifier_type, iterator_type, context_type); } } }
文字定义.hpp:
#include <boost/spirit/home/x3.hpp> #include "literals.hpp" namespace kyle { namespace parser { namespace impl { namespace x3 = boost::spirit::x3; const identifier_type identifier = "identifier"; auto const identifier_def = x3::alpha >> *x3::alnum; BOOST_SPIRIT_DEFINE(identifier) } impl::identifier_type identifier(){ return impl::identifier; } } }
文字.hpp:
#include <boost/spirit/home/x3.hpp> namespace kyle{ namespace parser{ namespace impl { namespace x3 = boost::spirit::x3; struct identifier_class; typedef x3::rule<identifier_class, std::string> identifier_type; BOOST_SPIRIT_DECLARE(identifier_type) } impl::identifier_type identifier(); } }
主要.cpp:
#include "literals.hpp" #include <iostream> template<typename Parser> bool test(std::string const& str, Parser p, std::string& output, bool full_match = true) { auto in = str.begin(); auto end = str.end(); bool ret = boost::spirit::x3::phrase_parse(in, end, p, boost::spirit::x3::space, output); ret &= (!full_match || (in == end)); return ret; } int main(){ std::string s; auto b = test("fobar", kyle::parser::identifier(), s); std::cout << b << ": " << s << std::endl; }
CMakeLists.txt:
ADD_EXECUTABLE(sox3 main.cpp literals.cpp) SET(CMAKE_CXX_COMPILER g++-5) SET(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -isystem /home/sehe/custom/boost -std=c++14 -O3 -pthread -march=native -flto)
关于c++ - 使用 boost spirit x3 分离解析器时出现链接错误,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/40496357/